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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbddc271d00e089a584d4dbb2dce400224abed2b288a61d211c2b1564958a98' 
  AND token = 'HfAu3kxscY+9RDKm1fhIyE2e2cVCG/kvuau9LxYd0/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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