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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7015fb3d350e7cfa63f73154a40a5485c22c1c7724cf017ee8c575713be7aa' 
  AND token = 'ufI+oWciQuqX12ztLEjCnsp6OO3Ey2pWvxFM18i3JjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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