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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b93afc6bd345374f3f8d023025fc7215489c7df3b242a56b844d36b5fb4a07' 
  AND token = 'Y3IeH8fAdtdXVuVVidNx72dwHa8E55708QjcE3+YfPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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