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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84aad670068e929f4aa07d1327b71d42e4a05cd0f4f875fe348960161ed37d88' 
  AND token = 'w03ksIBq9aLSzKH+spWYCXVK34aZfMXHRHSYWyhVAiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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