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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c148d5a85766d3601f680b21111c450600bd45f37e63877ccf63b12c5513ff' 
  AND token = 'aB3T3thAOUUX0WTIWDe6PZsb9QQW+lwEem9m8Llmy2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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