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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf12b711c4ed43a8a81334f8879be8905848882f1dfe650845df8d4f62d30869' 
  AND token = 'wfliioSy6qcdVFoxKJ5NDISZzWqT4segEECs056SdA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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