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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071f0be90b8192255b7e1a3bab8e6a937098d3b0109b05d96a64c519a18bb7f6' 
  AND token = '27N7BaE40uFZOsM6bY9Sk9QzZnFP7YYses1YHim4pxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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