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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab7ff613deb3a2933f88347d58949cc311b2779b3466b3049a1055ed09a9f49' 
  AND token = 'cApMW+Ei/qBnJFmW8GW2hquqHD4SltA5SoQUxsDMf60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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