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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9ad05efdba01a105968a0bb30a1466e3c861fb4e1a9d64fc07e00d9db7663e' 
  AND token = 'VzznQ/Dwhw8IYLBhmi577/otdxCm2JmJSQPX4+7MPnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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