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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c6c067b825411778a488a5b71465db08565e5134e85c94f253f62d2247b710' 
  AND token = 'wAw1kypz6X2AEL2NdM/2rGEe1AQb4+irx7ppMraRhkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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