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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5552a2bf535eb4b39dc91031b862c28cd1393cc73aa932ccaa1bbd42dc366896' 
  AND token = 'YPNRhYaSRN2z7ArptgZ83H6Qc3KBt0BA/UJncerQYTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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