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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3517f5d9723d71b0813ad6bb6f0d6df162e391ac3eef287c1d33f6e9b4b1303' 
  AND token = 'YXCnLNPrrhKyw1QFyhLkR2fZSW+ZY/dSTzhLuGL77AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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