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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c489638878a27afc4ed0f573b272651c80aea0f9fe8780704554986fed4c0354' 
  AND token = 'htKYkOfShf0xKvcJKsLx/eA4izBc9NXpcghiuImHbmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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