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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670232904e657d8dd6d2b8f6dc0dc318aed3030174814a89b0f2c7039f16e82d' 
  AND token = 'nYEBGNntqSbTaTj1kq+GtziI5PHkKAbRU2Zya584chY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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