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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969b7f4bd4aa422c1910fc82a068bd7edaf170b8c1db5f4dca7c1d3b4106adf6' 
  AND token = 'POVZDMCDxvGx+RmBa+7b+hZKKy+hDd41cIae9ynbvsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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