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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0664b9222dbb71422bf40b226f05a735c925dea6d97742121c27dd79e2cc2bfe' 
  AND token = 'Xu8r63CxR3gVNBZS+Et9WramfflczF0v9PeAyNewZUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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