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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c049ed30cf724b2716b9d5fa74cf3ba651435cd696742cecc3f29cb324a97ed' 
  AND token = 'lP/sEVtCweG1NOe6xnjjXa/J4CwYu4VpMs/591JnRnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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