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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bad0f24b749dbd6288eba1e2a7ada9b6cd8cb4b685491be552615150e28df49' 
  AND token = '3Ml+8cFJBKiLVbft5R3PJ6oCGmk1uMDVuLVy4DjFZNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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