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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc82e3d0e3a51b8c8c5d2d8296b842d9ce3df239ef7f124d51ab386741dc1480' 
  AND token = 'fKtR7earnrkMEe98A6W/oPgLVmSoqfqdJvJ6dU9DiI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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