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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941182a5acb73de1fcff5498a195ebab615f389aaaa16afaf7c23cb3ac34e093' 
  AND token = 'J7uHKHpR83r6a21RXjyCBOT7MCwVgYYVobyDlqSpeho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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