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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f47612290a43ec31b028d70f4a1d0f58163d41aacd3dbf1564eed8d2b11c63b' 
  AND token = '4H76py1aroPQ3cHBo6s6RiQ3hPXG2upaAN3vbEnYfdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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