SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6b2bb0147fea245de5f7d6a9bc3718977101ae2c560cca749b057d0cd5fd92' 
  AND token = 'SHT/87jJbZi4vpzgRK1dFkj8+JXowW9CJP+hSm3ulOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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