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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99afff700d45c16af73509849e4478201131fd55a7987fe6d64a90af019b71a' 
  AND token = 'kVfjmumO3REmHZkKkNDjxKP9NfcRJRw765zhLX0CBoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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