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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7dee90fc9cdea43281dddb14442f4fc0713c968e181f08a4ce1b3964876604' 
  AND token = '7xjXtLn3am63qmg/VPL0LP+oYmcQo3OPJourL9oMzuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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