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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c92d6c09c6dd01e1e6b243d4ece0b4817a6af94adcd4d31d00a5e3be362923' 
  AND token = 'mgjhnpDl5P+HFDkpP1NIOg3m/butq4eQQLeKgsu9wm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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