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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e529709f76dae16332343b51743204f7f7653059171b4c13843e05f13fde9b9b' 
  AND token = 'uxAZnN/lfsSarnkDH/blcuqu1cJrYkNH1G49oYU0IJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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