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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ade5873b063c6ae7f97768b8324748024c851cb8f5c4c8998398e10a535c85' 
  AND token = '3Hy13Ij+OisRo6V/Ce3CA1OC8K/djWzTYLYMifJiQKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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