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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb7c110e661b5df644816636d07830ff9d3617b33c496bb66d1e88033f8602a' 
  AND token = '4oHXhszLQpsO6o/d8mVAEUQCyjQFfmr7GZp6oF7M5D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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