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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55afa397c319ae6a9b6834555fb220dd2dddef56ad466d4f98f83bc2797b2e03' 
  AND token = 'wA0/ZfS2XsejBNx7LFiL5ALHzHWtCXyN4xG9lluen6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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