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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a98b5d038fe6e26cb54cf3141f898f9c0e0178ee721ae256f40ff5f2a8e17e8' 
  AND token = 'NEx56KUhT5tftn848+2q6CJmeyaOdEcUht0gT3dTmQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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