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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50aef332122045bf1e2617283fb9d43999d9677788c13621165fb0c0f021bd3' 
  AND token = '86GrlPAyvZ8GL0A6Mv++OqS55FJa0WFG2BOjQtTeK2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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