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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec26c8a950e19e51d3c788e57674c6c7e61c54f4b877c22dae199c16cdc16b4' 
  AND token = 'BG2RESvARzp96c5nMIWV8x0GMa2scU/GczwszGD8Ocs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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