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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2849fde97dd6c20820bea607de48beff9dcc0b7d965baaad0af948e632d096b1' 
  AND token = 'AfZv5BbdtxBjq1Cuiiy84oRQhXigsnb1T/2fWQY/id4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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