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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d05650185876c2350a9405d49bbf289e07d406c718ce1791ff3f1823d910163' 
  AND token = 'OmKezdi1YZ3L+VpFNsEaPtTG5Q+SEpcNaRzECCRNEjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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