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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0955437887b90dab66c617fd79836a6ea54e8df7836625104b220173833728' 
  AND token = 'xC19D8bc6e7YLb38zNsViB8ELb4WiZg/VGN+LOdkzIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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