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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f743224b6b7e7770d0f6463d610a0def17b5dd14401deda9fa98b521dc16a968' 
  AND token = 'xaLl6JCxh8FxVd31qUvedvMBd1CxU7F714qC2aZ8nkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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