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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a59aace78cc53dbd85b0d0161c2ab250fcc796f4736aed25872ac0ffcc3860' 
  AND token = 'fh4K/mR7UnevZ8kcowqe2yT3aH5PB32vtSfnsKc5wnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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