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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91340196458ec5de29d20ba0c806c032af5ada510435d38f48adc327795abf6' 
  AND token = 'yOE7DFTB/g/L0Oe0/uXyhF89qswBTSmYKpysN0s6cxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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