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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d91e1983e8788b8f7947d89c64039d8a097100ba0c1791b1796e2d5f4108f7' 
  AND token = 'oV6M5Tii9i4a++j4Dd4OQrIWwl6Y1Sz68yExFUAPjeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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