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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0364d1bce7e93af6d674053c169eb48c41686581736951d30353bf0171981fb' 
  AND token = 'lwHF2AA/A3CP2+r8sDm6f/BejkuKUV8Zm6m9uxwOpN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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