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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e96949247f004399f80947aaa0652a0b28d54d600f5fea2d82d132d79d882ca' 
  AND token = '1UL69oRbN42zdRKpxGrIL++nH2wB6uPF7Tio6xIxoFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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