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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5124bd1d1a6ebf72bbdf88439f28b0ba6205b56be92c94b4f28d46eb1a37af99' 
  AND token = 'bKZUPIoa7ppMiOAeryo1pwAv+fllEPIHdLMZ8asT9hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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