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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce472956e50ab241486e7919bed8e8220ee0c419256e7641f5f805c3b5a49137' 
  AND token = 'mzU/DE+15eET/dj+/p2FZHxlemS0rUBljF2a+UYLEm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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