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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3823362906e676ffb3f5c4c90ffadb88190d0dc375f2646c38d4bd9a1a8f797' 
  AND token = '8sdOGqnJpq6o+ffSTcHYbokGQq5PxKd5GYc2c6LXA0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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