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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61db6e1ecb8f8cd4f2d7f277115f8ea492d3fdb21d88eaaeae729581a5b25ea5' 
  AND token = 'VMkgQhDa+nRVVNHr+m+1YqHRiS4ROI17G3Qrmq56ZMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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