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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135e10467fd32fbee50b1c75248fc9aa2c7d2ae8b9edde5fd3fa903e46f5c2b5' 
  AND token = '/6bQcJWadVA+vGo2de5nGFFtYuUrNBY5/bFSE6s/PxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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