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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40604dda788f4ef8f3a9d99dd8c5ec254659bdb180b1d0eba150a96ab02cf84' 
  AND token = 'v96SRfuk95nn8iDIdMZ3M0HPv+cxpGjDA3bPyKL0tNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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