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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4959172d09aab1f942c91e60c1ec1039bb878af5bdb575eb6f31949f1a780c4b' 
  AND token = 'a30FGzOGKY35I0ujHFD8U/LjmyOL/BSP13AmBa8ICso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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