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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a8f58542ece1b6988e21c10fe09c4ab71ea2b174ccfcd017cd3d4d17ddd38d' 
  AND token = 'kw6NCiL/tLdvpurrPmL4+pLAM9OkJ3Ces36cWhHy9u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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