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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494cf9846ec34243b5eca5c6a1c7dc3a9d779d2ba424fec9472fb3fcbd39c5ba' 
  AND token = 'bcB7AP5HhJ/AFTkaeuBDEK6b8WMW39Z1/tgBJSXb0Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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