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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359bbbfbdd3d27447c57dc3e62d067bf104c31cd9b24e1529662840ffe894091' 
  AND token = 'vrbmxk6tx461QJ31/NY8kP5mwys/4+gDZY88p3I+1rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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