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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c8d5ba95d4ac548dd381d39d612216271c8a821e85a06cd802aee201dc96f5' 
  AND token = 'xGtsbu2KV66HdhswS2IaHjhulrnP06WzdtHtGHjQDzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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