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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd0a7380073f91ce5ec4af8e5205565292dd31f3d8c92ac058d6f203a984e91' 
  AND token = '4frzCD+sfxb2e2AYO49qhEeu8TYonKNj8G2rlhqKeIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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