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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fba70797b58b63ad575a585ee8a91354947330eb101a42ac6ed7940deff5f71' 
  AND token = 'D0ptni76fAIOIhvEwwpOf3KOR/cBq2EvvAlOu549RVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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