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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02347b85f7a23557754298013cccf510121f2a6ab9d1db29aef69e67c9fac64' 
  AND token = 'ZqA7+f4LaQbrDY7N+urdrynWZwscl7p2VSDf5tXkiKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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