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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb3af7b435628b5aafba335a7fbd3c64571df72fad526e5198843d5209f40da' 
  AND token = 'HJXPAsm5rzq0DoWjGcM355JhXkRAMm737HuY3rWrKAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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