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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bb15c6560c44fa08dbed3820edf478c558a44464c1ebcb18401c203b430907' 
  AND token = 'RC6ayRjvtcfhotSdxkM1gj4oyAjF90Z1nvyQxqpTPdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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