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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4b627a6e333f77002fc69a69f7d8cde1ff432ee38be66f8d82a44ae6d27162' 
  AND token = 'gRD+8ROJa9A+kwk1Jjgv8wnWbXZ8Y0aXIsckad7PzgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}