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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175bbf30b104aa3a8d28005b6721458b186ea01e29b44fb8269d39063870787b' 
  AND token = 'J3w6FPtL9aQSpDNAXE0kTMI73fnbNcysF4U0hnOo0Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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