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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa637a1a32c802c89d4734bc4aaf587e868e16e88caf58d224421a2130ce7325' 
  AND token = 'Jq7J8MQ5DeLnv6T59wGLK2h1cbLvTV2wdHkEsYxPVD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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