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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a247e367770558b2370528caeb6c20af2db1dd14aee50b928fa4ed5f2a88c2ef' 
  AND token = 'UNekODVEZP62im8DZb9pQr+jN77ZaG+9R8zVcr0hEkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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