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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c4e8b4fde9ff548ff0657e9d914667e6f5125a6d7f39fc858f30182815bafe' 
  AND token = 'EZNISt9ew0/r3CRHz3eukn6+kGf5kgnL5GbAj085Ao4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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