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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c36ed36a71f4dfffa1d7d7f2d561fbadbc71262f6808a43a4303a8e0eeb762' 
  AND token = 'u8/8IedL9hjZkq7b5/EOWazZmJcj6bIUxPMXTWT4Fy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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