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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c383b5975ccd21e8488d458743c190a01f263238eec73b6f8a79df4d9364a52' 
  AND token = '8oSceShaE1IZAfMJ6FuqptkoI+ni7h3MiKuwMP/ETxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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