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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36cefd80b6037c2db39710c89fbf52cf4d2e15d59eda369a7ac65d8e03f14dd0' 
  AND token = 'rRqtWCg1UCp/emjzsljoDxasUWnbwlsLv07xe2P0MNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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