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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d44d73b3d076a31e449ac3f603924e550b64c6586b6a5d13bc49cf8c9f4ddf' 
  AND token = 'CyG8txJE7tf+sEfL8ueNfFcKqyNmScROEMtz3TQUB1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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