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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c90f941654ac446b0e4c8d8f9f1a848a51b64cfc5fc39b719a0ede6be2035b' 
  AND token = '8t9ySHVu54ldPwN/awOdBVqnzdEs7rAZTIDaF01XBwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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