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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e145b4902b039ce29fb778626679262c7328e8a5095f934b6fcbeedd73e28fed' 
  AND token = 'lmoBPk71pBCG9O0VR5voWok97hHAjkPvBdL19YeeaqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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