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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c16815d0a890724e185fa1dcc3e23d7d304d50aea3b9effaf16aba440f3c0c' 
  AND token = 'Sx/qCD15swn3OYVtUJj/wNboxkgJH13u771Nppcu0Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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