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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daec8804cefcae44bbb759d9fd47fb60fe9e986a5213ee236229b875b0f39b7f' 
  AND token = 'zcY7hwUNbzh0bSnmOQ49kIxtk7e/Ii62XAKfI/WDV8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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